Patent GB-113995-A (GB)
Title: Improvements in or relating to Veldtschoen Lasting and Sewing Machines.
IPC: A43D113/00
Filed: 1917-02-13
Abstract: 113,995. British United Shoe Machinery Co., (United Shoe Machinery Co.). Feb. 13,1917. Boot-sole stitching and lasting machines. - In veldscboen lasting and sewing machines, the.gripper mechanism is constructed and arranged to tension the upper adequately at the various parts of the shoe and lay the margin flat on the margin of the sole by a movement of the grippers down the side of the last, and also to stretch or crowd the upper margin longitudinally as required by the contour of the sole margin at the part of the shoe being operated on. The gripper comprises two jaws 100, 200, Fig. 8. The lower jaw 100 has thin edges 102, 103 which lie towards the crease of the shoe and the presser foot respectively, and these edges are overhung by lips 201, 203 on the upper jaw 200 so that the upper margin, where it emerges from the gripper, is substantially on the surface of the margin of the sole when being presented to the stitch-forming devices. The opposed surfaces of the jaws are provided with transverse corrugations which increase in depth, from the edges 102, 201, in order to stretch the margin of the upper increasingly from the crease of the shoe to the edge of the sole. The lower jaw is carried by an arm 101, Fig. 10, of a lever 104 which is journaled on the shaft 202, Fig. 3, carrying the upper jaw by the arm 201<*>, and is controlled by an adjustable tension spring secured to its rear end and adjustable stops 106 coacting on each side of the web 103. The adequate tension on the upper at different parts of the shoe is normally determined by the amount of slip between the upper and the grippers, but the lower stop may be manually controlled as by a treadle to determine the point at which the grippers engage the upper. The shaft 202 passes through, a bearing 204 of a carrier 206 and has a sliding and driving connexion with a shaft 212 passing through the bearings 222. 240 on the carrier. The connexion is enclosed in a sleeve 210 secured to the shaft 202 and a compression spring 220 is interposed between the bearing 222 and the end of the sleeve so that the gripper is held resiliently in the crease of the shoe when the latter is held up to the stitching-devices by the operator. The shaft 212 is actuated to raise the jaw 200. by. a torsion spring 230. which is adjustable by being connected at one end to a loose collar 232 having a tooth 234 adapted to engage any one of the teeth on a collar 236 fixed to the shaft, the position of the jaw being determined by an adjustable stop 244 carried by an arm 242 secured to the end of the shaft. This arm also carries a rod 252, under the control of a strong.adjustable spring and provided at its end with a roller 246 which engages a cam 250 by which the shafts 212. 202 are rocked to cause the gripper jaws to come together and grip the upper margin and tension it about the last. The carrier 206 is pivoted to the frame of the machine at 336 and is held by a spring 342 against an adjustable stop 344. Feeding movements are given to the gripper of an amount equal to greater than. or less than the movements o! the feeding mechanism according to the amount of longitudinal stretching.of the upper margin required by connecting the carrier 206 to the feeding mechanism. In the machine described, which embodies various features disclosed in Specifications 262/82, 17533/87, and 8541/92, the main feed is by the awl which receives its feeding movements from a reciprocating carrier 726, This carrier is provided with a plate 800, to which is pivoted at 802 a lever 804 with a depending lug 806 carrying a pin 810 surrounded by a compression spring 812 seated at one end against the lug and at the other end in a socket of the gripper carrier 206. The free end of the lever is adapted to engage a spring catch 830 which is carried by the carrier 206 and is adapted to be tripped at the proper time by a projection on the awl-actuating lever 706. For feed movements of the gripper equal to or less than those of the awl, the latch 830 is adjusted on the carrier so as to provide equal movements of the carriers 726, 206 or to provide any amount of lost motion between them. For movements of the gripper greater than those of the awl, a stop 815 is adapted to be brought into position to contact with the lug 806 and add the movement of the free end of the lever about its pivot 802 to the linear movement of the carrier 726. The stop 815 is carried by a bar 816 and is adjusted by a lever 820 with a screw 822 of steep pitch which is threaded into an enlargement 823 of the bar. Mechanism also may be provided for varying the tensioning effect of the gripper conjointly with the variation of its feeding movement comprising a lever 400, pivoted to the frame at 402 and resiliently connected to the carrier 206 through the rod 412 and spring 416. The lever carries a roller 404 which contacts with the cammed end 105 of the lever 104 which carries the lower gripping jaw. Relative movement of the roller 404 and surface 105 raises the end of the lever 104 and relieves the spring surrounding the rod 252 of the opposing effect of the spring controlling the lever 104. The lever 400 is made in two hinged parts so that it may be moved out of position when not required. When the roller is in use, the lower stop acting on the lever 104 is out of action.